Upgrade vs. Update
An update improves the same version of software or OS, whereas an upgrade is a complete version change. For example, Windows 8.1 is considered an update from Windows 8, whereas Windows 10 is a complete upgrade. Upgrades typically cost money, but are sometimes offered for free. Version numbers can be confusing, which may be why version numbers often have unique names associated with them.
Do I have to Upgrade?
No, you do not have to upgrade. They may promote it as if you do, but ultimately it is up to you. Even if the company is no longer supporting the version you are on, doesn't mean you can't keep using it. It just means you will be on your own, to some degree. Case-in-point, there are still a lot of people using Windows XP. They just have to live with the limited functionality and security vulnerabilities.
Updates, on the other hands, are usually a good idea, especially if they are patching security flaws. Occasionally an update can cause problems, but most software makers are quick to correct them.
Which OS X Versions are Currently Supported?
10.11... El Capitan
10.8... Mountain Lion
If you are using a version before any of these, you are probably already finding it difficult to get compatible apps and updates. It will only get worse as time goes on. More importantly, Apple will not be releasing security updates to older versions, so if vulnerabilities are discovered, you're on your own.
Handy Universal Keyboard Shortcuts
Ctl+C - Copy the selected text or image to the clipboard
Ctl+V - Paste the clipped text or image to the location you selected
Ctl+Z - Undo the last thing you did. (Otherwise know as the "oops" button)
Ctl+P - Print the page you are in or the selected text
Ctl+S - Save your current document
(Mac users replace the Ctl with the Command button)
Knowledge is Power
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